The main selling point is the speed. Julia is high performance - in the same class as C, C++, Rust etc (perhaps 1.5x slower on average, but still pretty fast). This allows you to write all your code in Julia rather than just the surface level wrapper.
Then, because it's 20 years younger than Python, it has tonnes of ergonomics you would expect of a modern language: A nice, built-in package manager. Good code introspection. Easy ability to call C. An actually usable REPL. Built-in unit testing etc.
Then, because it's 20 years younger than Python, it has tonnes of ergonomics you would expect of a modern language: A nice, built-in package manager. Good code introspection. Easy ability to call C. An actually usable REPL. Built-in unit testing etc.